Abstract

We present novel metamaterial structures based upon various planar wallpaper groups, in both hexagonal and square unit cells. An investigation of metamaterials consisting of one, two, and three unique sub-lattices with resonant frequencies in the terahertz (THz) was performed. We describe the theory, perform simulations, and conduct experiments to characterize these multiple element metamaterials. A method for using these new structures as a means for bio/chemical hazard detection, as well as electromagnetic signature control is proposed.

Figures (5)

Simulated unit cell and a single primitive cell. (a) Diagram of simulated n=3 hexagonal MM. Also shown are the assigned periodic boundary pairs used in simulation. (b) Single primitive cell with dimensions labeled. The lower portion of the figure gives the values of the labeled parameters used in our designs.

Simulated electric field and surface current for n=3 hexagonal metamaterial(a) current density and electric field plots at ω1 (b) current density and electric field plots at ω2 (c) current density and electric field plots at ω3.

Simulation and experimental results for our different n=1,2, and 3 metamaterial designs. The left column shows the unit cell models, images taken of the fabricated samples are in the middle column, and plots of simulated (black curve) and experimental data (red curve) are shown in the right column.

Computational (left) and experimental (right) measurements of the n=3 hexagonal metamaterial, and the n=2 square checkerboard metamaterial, compared to experimental measurements of the molecule biotin. Simulated and experimental transmission spectra of the hexagonal metamaterial has been shifted up by 20% for clarity and T(ω) of biotin is in arbitrary units.